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linux/scripts/extract-vmlinux

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scripts: add extract-vmlinux This script can be used to extract vmlinux from a compressed kernel image (bzImage, etc..). It's inspired from (a subset of) extract-ikconfig. It's something a lot of people have been looking for (mainly people with xen < 4 that doesn't support bzImages at all). Signed-off-by: Corentin Chary <corentincj@iksaif.net> Signed-off-by: Michal Marek <mmarek@suse.cz>
2011-08-16 10:46:05 +02:00
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 378 Based on 1 normalized pattern(s): licensed under the gnu general public license version 2 gplv2 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 5 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Armijn Hemel <armijn@tjaldur.nl> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190531081036.993848054@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-31 01:09:38 -07:00
scripts: add extract-vmlinux This script can be used to extract vmlinux from a compressed kernel image (bzImage, etc..). It's inspired from (a subset of) extract-ikconfig. It's something a lot of people have been looking for (mainly people with xen < 4 that doesn't support bzImages at all). Signed-off-by: Corentin Chary <corentincj@iksaif.net> Signed-off-by: Michal Marek <mmarek@suse.cz>
2011-08-16 10:46:05 +02:00
extract-vmlinux: Output used decompression method When extract-vmlinux succeeds, it doesn't output which decompression method was found at which offset. Adding this additional output in check_vmlinux() helps troubleshooting and reverse-engineering images. The last check_vmlinux() call was also quoted to accept spaces. Signed-off-by: Maxime Thiebaut <maxime+kernel@thiebaut.dev> Reviewed-by: Nicolas Schier <nsc@kernel.org> Link: https://lore.kernel.org/r/X6OQ4pHdpreJtlTnf0tFEb4Uxz8T8gFv_7Yw6tpBK4ZBgHYjJr_URwUwCVynpkb-H8Yjk7DdBF01zY-sfqu_7N5trZQfcd6s_4PtdGlHtlA=@thiebaut.dev Signed-off-by: Nathan Chancellor <nathan@kernel.org>
2025-08-22 10:40:03 +02:00
scripts: add extract-vmlinux This script can be used to extract vmlinux from a compressed kernel image (bzImage, etc..). It's inspired from (a subset of) extract-ikconfig. It's something a lot of people have been looking for (mainly people with xen < 4 that doesn't support bzImages at all). Signed-off-by: Corentin Chary <corentincj@iksaif.net> Signed-off-by: Michal Marek <mmarek@suse.cz>
2011-08-16 10:46:05 +02:00
scripts: add zboot support to extract-vmlinux Zboot compressed kernel images are used for arm64 kernels on various distros. extract-vmlinux fails with those kernels because the wrapped image is another PE. While this could be a bit confusing, the tools primary purpose of unwrapping and decompressing the contained kernel image makes it the obvious place for this functionality. Add a 'file' check in check_vmlinux() that detects a contained PE image before trying readelf. Recent (FILES_39, Jun/2020) file implementations output something like: "Linux kernel ARM64 boot executable Image, little-endian, 4K pages" Which is also a stronger statement than readelf provides so drop that part of the comment. At the same time this means that kernel images which don't appear to contain a compressed image will be returned rather than reporting an error. Which matches the behavior for existing ELF files. The extracted PE image can then be inspected, or used as would any other kernel PE. Signed-off-by: Jeremy Linton <jeremy.linton@arm.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2025-07-14 17:29:23 -05:00
extract-vmlinux: Output used decompression method When extract-vmlinux succeeds, it doesn't output which decompression method was found at which offset. Adding this additional output in check_vmlinux() helps troubleshooting and reverse-engineering images. The last check_vmlinux() call was also quoted to accept spaces. Signed-off-by: Maxime Thiebaut <maxime+kernel@thiebaut.dev> Reviewed-by: Nicolas Schier <nsc@kernel.org> Link: https://lore.kernel.org/r/X6OQ4pHdpreJtlTnf0tFEb4Uxz8T8gFv_7Yw6tpBK4ZBgHYjJr_URwUwCVynpkb-H8Yjk7DdBF01zY-sfqu_7N5trZQfcd6s_4PtdGlHtlA=@thiebaut.dev Signed-off-by: Nathan Chancellor <nathan@kernel.org>
2025-08-22 10:40:03 +02:00
scripts: add zboot support to extract-vmlinux Zboot compressed kernel images are used for arm64 kernels on various distros. extract-vmlinux fails with those kernels because the wrapped image is another PE. While this could be a bit confusing, the tools primary purpose of unwrapping and decompressing the contained kernel image makes it the obvious place for this functionality. Add a 'file' check in check_vmlinux() that detects a contained PE image before trying readelf. Recent (FILES_39, Jun/2020) file implementations output something like: "Linux kernel ARM64 boot executable Image, little-endian, 4K pages" Which is also a stronger statement than readelf provides so drop that part of the comment. At the same time this means that kernel images which don't appear to contain a compressed image will be returned rather than reporting an error. Which matches the behavior for existing ELF files. The extracted PE image can then be inspected, or used as would any other kernel PE. Signed-off-by: Jeremy Linton <jeremy.linton@arm.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2025-07-14 17:29:23 -05:00
scripts: add extract-vmlinux This script can be used to extract vmlinux from a compressed kernel image (bzImage, etc..). It's inspired from (a subset of) extract-ikconfig. It's something a lot of people have been looking for (mainly people with xen < 4 that doesn't support bzImages at all). Signed-off-by: Corentin Chary <corentincj@iksaif.net> Signed-off-by: Michal Marek <mmarek@suse.cz>
2011-08-16 10:46:05 +02:00
extract-vmlinux: Output used decompression method When extract-vmlinux succeeds, it doesn't output which decompression method was found at which offset. Adding this additional output in check_vmlinux() helps troubleshooting and reverse-engineering images. The last check_vmlinux() call was also quoted to accept spaces. Signed-off-by: Maxime Thiebaut <maxime+kernel@thiebaut.dev> Reviewed-by: Nicolas Schier <nsc@kernel.org> Link: https://lore.kernel.org/r/X6OQ4pHdpreJtlTnf0tFEb4Uxz8T8gFv_7Yw6tpBK4ZBgHYjJr_URwUwCVynpkb-H8Yjk7DdBF01zY-sfqu_7N5trZQfcd6s_4PtdGlHtlA=@thiebaut.dev Signed-off-by: Nathan Chancellor <nathan@kernel.org>
2025-08-22 10:40:03 +02:00
scripts: add extract-vmlinux This script can be used to extract vmlinux from a compressed kernel image (bzImage, etc..). It's inspired from (a subset of) extract-ikconfig. It's something a lot of people have been looking for (mainly people with xen < 4 that doesn't support bzImages at all). Signed-off-by: Corentin Chary <corentincj@iksaif.net> Signed-off-by: Michal Marek <mmarek@suse.cz>
2011-08-16 10:46:05 +02:00
scripts: teach extract-vmlinux about LZ4 and ZSTD Note that the LZ4 signature is different than that of modern LZ4 as we use the "legacy" format which suffers from some downsides like inability to disable compression. Signed-off-by: Adam Borowski <kilobyte@angband.pl> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-07 02:15:48 +02:00
scripts: add extract-vmlinux This script can be used to extract vmlinux from a compressed kernel image (bzImage, etc..). It's inspired from (a subset of) extract-ikconfig. It's something a lot of people have been looking for (mainly people with xen < 4 that doesn't support bzImages at all). Signed-off-by: Corentin Chary <corentincj@iksaif.net> Signed-off-by: Michal Marek <mmarek@suse.cz>
2011-08-16 10:46:05 +02:00
extract-vmlinux: Check for uncompressed image as fallback As on x86-64 and other architectures, the boot kernel on parisc (vmlinuz and bzImage) contains a full compressed copy of the final kernel executable (vmlinux.bin.gz), which one should be able to extract with the extract-vmlinux script. But on parisc extracting the kernel with extract-vmlinux fails. Currently the script first checks if the given file is an ELF file (which is true on parisc) and if so returns it. Thus on parisc we unexpectedly get back the vmlinuz boot file instead of the uncompressed vmlinux image. This patch fixes this issue by reverting the logic. It now first tries to find a compression signature in the given file and if that fails it checks the file itself as fallback. Signed-off-by: Helge Deller <deller@gmx.de>
2018-10-16 08:03:24 +02:00
extract-vmlinux: Output used decompression method When extract-vmlinux succeeds, it doesn't output which decompression method was found at which offset. Adding this additional output in check_vmlinux() helps troubleshooting and reverse-engineering images. The last check_vmlinux() call was also quoted to accept spaces. Signed-off-by: Maxime Thiebaut <maxime+kernel@thiebaut.dev> Reviewed-by: Nicolas Schier <nsc@kernel.org> Link: https://lore.kernel.org/r/X6OQ4pHdpreJtlTnf0tFEb4Uxz8T8gFv_7Yw6tpBK4ZBgHYjJr_URwUwCVynpkb-H8Yjk7DdBF01zY-sfqu_7N5trZQfcd6s_4PtdGlHtlA=@thiebaut.dev Signed-off-by: Nathan Chancellor <nathan@kernel.org>
2025-08-22 10:40:03 +02:00
extract-vmlinux: Check for uncompressed image as fallback As on x86-64 and other architectures, the boot kernel on parisc (vmlinuz and bzImage) contains a full compressed copy of the final kernel executable (vmlinux.bin.gz), which one should be able to extract with the extract-vmlinux script. But on parisc extracting the kernel with extract-vmlinux fails. Currently the script first checks if the given file is an ELF file (which is true on parisc) and if so returns it. Thus on parisc we unexpectedly get back the vmlinuz boot file instead of the uncompressed vmlinux image. This patch fixes this issue by reverting the logic. It now first tries to find a compression signature in the given file and if that fails it checks the file itself as fallback. Signed-off-by: Helge Deller <deller@gmx.de>
2018-10-16 08:03:24 +02:00
scripts: add extract-vmlinux This script can be used to extract vmlinux from a compressed kernel image (bzImage, etc..). It's inspired from (a subset of) extract-ikconfig. It's something a lot of people have been looking for (mainly people with xen < 4 that doesn't support bzImages at all). Signed-off-by: Corentin Chary <corentincj@iksaif.net> Signed-off-by: Michal Marek <mmarek@suse.cz>
2011-08-16 10:46:05 +02:00